Titanium Cathode Oxidation Layer for Foil Peeling
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Solution Overview
Problem
The existing methods for manufacturing metallic foils by electrolysis result in a difference in surface morphology between the peeling surface and the free surface, leading to adverse effects on the electric characteristics of electric storage devices, as the peeling surface is smooth while the free surface is uneven, and attempts to moderate the roughness have resulted in cracks and poor peeling.
Innovation Solution
An active oxidation treatment is performed on a smoothed titanium electrodeposition surface after a roughening treatment to form an oxidation layer with a specific thickness and roughness, reducing the difference in surface roughness between the peeling and free surfaces, facilitating easy peeling of the metallic film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrodeposition surface is made smooth to facilitate peeling, then the peeling process becomes easier, but the surface roughness difference between peeling surface and free surface increases adversely affecting electric characteristics
Solution Approach 1:
The invention applies different surface treatments to different regions of the electrodeposition surface. The peeling surface is treated to be smooth (Rz ≤ 2.0 μm) to facilitate peeling, while the free surface is allowed to have higher roughness (Rz ≥ 3.0 μm) to maintain electric characteristics. This local differentiation resolves the contradiction by optimizing each surface for its specific function.
Solution Approach 2:
The invention performs preliminary surface treatment on the electrodeposition surface before metal deposition to establish the desired roughness distribution. By pre-treating the surface with methods such as shot blasting, sand blasting, or chemical etching to create specific roughness patterns, the invention ensures that the peeling surface remains smooth after peeling while the free surface maintains appropriate roughness, thus resolving the surface roughness uniformity issue.
2Manufacturing precision
If the electrodeposition surface is roughened to reduce surface roughness difference, then the electric characteristics are improved, but the metal film peeling becomes difficult and may cause cracks
Solution Approach 1:
The invention applies different surface treatments to different regions of the electrodeposition surface. The peeling surface is treated to be smooth (Rz ≤ 2.0 μm) to facilitate peeling, while the free surface is allowed to have higher roughness (Rz ≥ 3.0 μm) to maintain electric characteristics. This local differentiation resolves the contradiction by optimizing each surface for its specific function.
3Ease of operation
If periodic maintenance such as mechanical polishing or electrolytic polishing is performed on the electrodeposition surface, then the peelability is improved, but the manufacturing complexity and time increase
Solution Approach 1:
The invention performs preliminary surface treatment on the electrodeposition surface before metal deposition to establish the desired roughness distribution. By pre-treating the surface with methods such as shot blasting, sand blasting, or chemical etching to create specific roughness patterns, the invention ensures that the peeling surface remains smooth after peeling while the free surface maintains appropriate roughness, thus resolving the surface roughness uniformity issue.
Solution Approach 2:
The invention changes the surface treatment parameters to achieve the desired effect. By controlling the surface roughness of the peeling surface to be Rz ≤ 2.0 μm through appropriate treatment methods and parameters, the invention facilitates peeling without requiring complex periodic maintenance, thus reducing manufacturing complexity while maintaining ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method allows for the easy peeling of the metallic film from the electrodeposition surface, reducing the surface roughness difference and enhancing the quality of the metallic foil, making it suitable for use as a positive electrode current collector in electric storage devices.
Implementation Method 1
performing anodic oxidation to form an oxidation layer with a thickness of 30 nm to 250 nm on an outermost layer and having a surface roughness RZJIS of 4 μm to 10 μm
Implementation Method 2
aluminum is electrodeposited on a specific surface (hereinafter, referred to as the 'electrodeposition surface') of the cathode drum by applying a current between both electrodes
Data Source
AI summary
Provided are a metallic foil manufacturing method in which a metallic film electrodeposited by electrolysis on the surface of an electrodeposition surface of a cathode is peeled off to form a metallic foil, and the electrodeposition surface used therein is obtained by subjecting a roughened surface, which results from roughening a smoothed surface made of titanium or titanium alloy using a blast treatment, etc., to an oxidation treatment selected from thermal oxidation, anodic oxidation (preferably anodic oxidation carried out while moving the anodic oxidation solution), or a combination treatment of thermal oxidation and anodic oxidation so that the electrodeposition surface has an oxidation layer with a thickness of 30 to 250 nm on the uppermost layer and has a surface roughness RZJIS of 4 to 10 μm.